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Old 11-08-2018, 03:06 AM   #1
StrnWolf
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Default Torque Specs for Exhaust

I need to replace my exhaust manifold gasket, which I can say is most likely because I was a victim of a bad mechanic. They cut my brand new fuel filter on purpose, so I have almost no doubt they did this because somehow the studs are not screwed into the engine fully any more, not even finger tight. So, I need to know the proper torque for the studs in the engine and for the nuts on the stud. Also, would like to know where I can get new nuts if possible. I have a 1995 Saturn SL2

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Old 11-08-2018, 09:29 AM   #2
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Default Re: Torque Specs for Exhaust

Studs: 106 in/lbs (8.83 ft/lbs)
Nuts: 16 ft/lbs

If you have a junkyard nearby the intake manifold studs are the same thread pattern, only longer on the manifold side (possibly on head side too), if you get a high(er) $$ item they'll probably throw the bolts in for free. Otherwise I'd try Home Depot or Fastenel, I'd bet Fastenel is more likely to have the required metric thread.
At the very least I'd get 2 intake manifold studs with nuts to have on hand in-case the starter dies, replace the bolts for the starter with the studs and not fight blindly for hours getting the starter back in.

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Old 11-10-2018, 01:27 AM   #3
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Default Re: Torque Specs for Exhaust

Quote:
Originally Posted by fetchitfido View Post
Studs: 106 in/lbs (8.83 ft/lbs)
Nuts: 16 ft/lbs

If you have a junkyard nearby the intake manifold studs are the same thread pattern, only longer on the manifold side (possibly on head side too), if you get a high(er) $$ item they'll probably throw the bolts in for free. Otherwise I'd try Home Depot or Fastenel, I'd bet Fastenel is more likely to have the required metric thread.
At the very least I'd get 2 intake manifold studs with nuts to have on hand in-case the starter dies, replace the bolts for the starter with the studs and not fight blindly for hours getting the starter back in.
Thank you! Do you also know what size bit I need for the studs? I do not have the socket for that size so I need to buy a set with the right size for it.

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Old 11-10-2018, 02:30 AM   #4
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Default Re: Torque Specs for Exhaust

It's an E7. It is in a set I got at Harbor Freight.

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Old 11-10-2018, 09:47 AM   #5
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Default Re: Torque Specs for Exhaust

It's a size E"snaps off as soon as you put the socket on it"
I was thinking E10, but it is pretty small so E7 could be right.

Pretty much every one I've taken out the nut locked itself to the stud and it came out as a bolt.

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Old 11-10-2018, 07:21 PM   #6
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Default Re: Torque Specs for Exhaust

Yeah, I think the smallest size I have is E 10 and the whole stud fit through the center down to nut. You may imagine how angry I was when even it was that loose I managed to move the stud in and out.

But also, yeah seems my nuts are stuck on too. Think ill pick some up from local yard and get them seperated to be all ready for my Saturn. I was thinking an E socket with a flare nut wrench to separate them while not in the engine.

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Old 11-11-2018, 11:53 PM   #7
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Default Re: Torque Specs for Exhaust

pretty sure the thread is M8X1.25 nut hex=13mm

It is said the OEM intake & exhaust studs are same composition...

Advance Auto sometimes has Ex Man studs by Dorman, which appear
to be good quality (but different length, & no torx section.

IF the car has seen a lot of roadsalt, the ExMan may be rusted on block mating face. In that case, maybe sandpaper flatter with Silicon Carbide paper on a 2"X4" wood sanding block.... That prep should last for 200kMi.

Last edited by TomM96; 11-11-2018 at 11:54 PM.. Reason: fergat un

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Old 11-12-2018, 01:25 AM   #8
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Default Re: Torque Specs for Exhaust

Quote:
Originally Posted by TomM96 View Post
pretty sure the thread is M8X1.25 nut hex=13mm

It is said the OEM intake & exhaust studs are same composition...

Advance Auto sometimes has Ex Man studs by Dorman, which appear
to be good quality (but different length, & no torx section.

IF the car has seen a lot of roadsalt, the ExMan may be rusted on block mating face. In that case, maybe sandpaper flatter with Silicon Carbide paper on a 2"X4" wood sanding block.... That prep should last for 200kMi.
Where I live we do not have any salt, our biggest harm is heat in summer and then its just any road flooding in winter as a vehicles enemy.

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Old 11-12-2018, 01:34 AM   #9
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Default Re: Torque Specs for Exhaust

Is there any special way to tighten the nuts on the manifold such as a pattern or in steps or anything like that?

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Old 11-12-2018, 09:15 AM   #10
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Default Re: Torque Specs for Exhaust

Generally (most any manifold,not just s-series) you go from the inside to the outside. Kind of a spiral pattern. I didn't have an issue starting at one end and going to the other but that doens't mean someone else also won't have an issue.

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Old 11-12-2018, 11:02 AM   #11
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Default Re: Torque Specs for Exhaust

Bolt pattern as fetchitfido states.
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Old 11-12-2018, 08:03 PM   #12
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Default Re: Torque Specs for Exhaust

Quote:
Originally Posted by fetchitfido View Post
Generally (most any manifold,not just s-series) you go from the inside to the outside. Kind of a spiral pattern. I didn't have an issue starting at one end and going to the other but that doens't mean someone else also won't have an issue.
man, your testing my OCD

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Old 11-16-2018, 12:52 AM   #13
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Default Re: Torque Specs for Exhaust

Thank you all very much!

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